Ultrastructure of attachment specializations of hexapods (Arthropoda): evolutionary patterns inferred from a revised ordinal phylogeny Author R. G. Beutel Author S. N. Gorb text J. Zool. Syst. Evol. Research 2001 39 177 207 journal article 10.1046/j.1439-0469.2001.00155.x 95b3d62f-8fcc-4088-873f-b33f4a63d3fc 2360323 32 Lepidoptera An arolium is usually present. Hairy pulvilli are described for Epiphyas ( Tortricidae ; Nielsen and Common 1991 : Fig. 41.3D) and Micropterix (Kristensen, personal communication). This condition is considered a groundplan feature of the order.